Xbox Games On Demand:
December 21: Red Dead Redemption
December 21: Prince of Persia The Forgotten Sands
December 28: Transformers: War for Cybertron
December 28: Just Cause 2
December 28: Ghostbusters

Xbox LIVE Avatar Marketplace:
December 15: Bomberman LIVE
December 15: Sonic the Hedgehog 4 Episode I
December 15: Winter Wear
December 23: Disney Sidekicks
December 23: University Collection (College Football Bowl Season)
December 23: Ninjas Collection

Xbox LIVE Arcade:
Starting December 22 through January 5, Microsoft Game Studios will introduce three new downloadable hits hits as part of Games for the Holidays, exclusively to Xbox LIVE Arcade and for gamers of every level :

December 22: A World of Keflings, 800 Microsoft Points and available worldwide
December 29: Raskulls, 800 Microsoft Points
January 5: ilomilo, 800 Microsoft Points